作者:朱凌波，路义萍，童剑飞，陆友莲，梁天骄

Authors:ZHU Ling-bo,LU Yi-ping,TONG Jian-fei,LU You-lian,LIANG Tian-jiao摘要:摘要:超临界液氢的热流特性是影响中国散裂中子源输出中子质量的关键因素，其对于退耦合液氢慢化器的优化设计具有重要意义。针对慢化器内部液氢的三维流动传热问题展开研究，建立相应的物理模型，并依据计算流体力学理论与外耦合方法完成了慢化器热源的施加以及热流场的数值模拟。结果表明：慢化器内部各结构的热沉积分布不均，主要集中于钆板与外部容器；为保证液氢对于慢化器的冷却效果，当入口截面积为394mm²时流量的最佳范围为60~90g/s；在临界区域附近，液氢热物性参数比热容的变化导致了湍流传热的恶化。为退耦合液氢慢化器的热设计提供参考。
Abstract:Abstract:The flow field distribution and thermal properties of supercritical hydrogen are crucial factors affecting the quality of neutrons output from Chinese. Spallation Neutron Source (CSNS), which may contribute to the optimization design of Decoupled Poisoned Hydrogen Moderator (DPHM). The three-dimensional flow and heat transfer of liquid hydrogen in the moderator was studied, and the corresponding physical model was established. Based on the Computational Fluid Dynamics (CFD) theory and the external coupling method, the application of the heat source of the moderator and the numerical simulation of heat flow filed were completed. The results show that affected by the proton beam incident direction, the thermal deposition in the moderator is unevenly distributed, mainly concentrated in the Cd plate and container. In order to ensure the cooling effect of liquid hydrogen, the best range of inlet flow is 60~90g/s when inlet cross-sectional area is 394mm². The change of specific heat capacity of liquid hydrogen near the critical region leads to the deterioration of turbulent heat transfer. The results provide a reference for thermal design of DPHM.

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